Documentation/snippets/controlling-spanner-visibility-after-a-line-break.ly


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

%% DO NOT EDIT this file manually; it is automatically
%% generated from LSR http://lsr.di.unimi.it
%% Make any changes in LSR itself, or in Documentation/snippets/new/ ,
%% and then run scripts/auxiliar/makelsr.py
%%
%% This file is in the public domain.
\version "2.18.0"

\header {
  lsrtags = "expressive-marks, tweaks-and-overrides"

  texidoc = "
The visibility of spanners which end on the first note following a line
break is controlled by the @code{after-line-breaking} callback
@code{ly:spanner::kill-zero-spanned-time}.

For objects such as glissandos and hairpins, the default behaviour is
to hide the spanner after a break; disabling the callback will allow
the left-broken span to be shown.

Conversely, spanners which are usually visible, such as text spans, can
be hidden by enabling the callback.

"
  doctitle = "Controlling spanner visibility after a line break"
} % begin verbatim

\paper { ragged-right = ##t }

\relative c'' {
  \override Hairpin.to-barline = ##f
  \override Glissando.breakable = ##t
  % show hairpin
  \override Hairpin.after-line-breaking = ##t
  % hide text span
  \override TextSpanner.after-line-breaking =
    #ly:spanner::kill-zero-spanned-time
  e2\<\startTextSpan
  % show glissando
  \override Glissando.after-line-breaking = ##t
  f2\glissando
  \break
  f,1\!\stopTextSpan
}